I am getting this issue as well.
Upon viewing the logs, I see this message:
[2018-09-11:15:21:59] Package signature validation failed
[2018-09-11:15:21:59] Got an unexpected fatal error while unpackaging: [ErrorEvent type=“error” bubbles=false cancelable=false eventPhase=2 text=“invalid package signature” errorID=5022]
[2018-09-11:15:22:05] Application Installer end with exit code 7
Edit: My issue is with the fflogs, not the wow logs.
Edit: I tried the solution here: [Win10] FF Logs Uploader can not be installed (Err: 5100) and it did not work.